Sephiroth Descends

"A jet-black feather floats down from the sky, a symbol of the despair eating at the heart of this world. The legendary hero Sephiroth has come!

Warriors of Light! Keep hope close to your breast, and face this mightiest of foes!"

- In-game description

Sephiroth Descends was a special multiplayer event, featuring battles against Sephiroth. The event is part of the Final Fantasy VII Collaboration Events, offered in February 2018.

Event Details

 * Event type: Multiplayer battle (guest Sicarius)
 * First instance: February 1 - 28, 2018
 * Second instance: January 1 - 31, 2019
 * Third instance: Oct 1 - Nov 1, 2019

How to Participate

 * Select Ring of Braves from the world map. Find a Party against Sephiroth at ★3 to ★5 difficulties, or Form a Party of your own, with your choice of other players.

Available Prizes
Defeating Sephiroth gains special event-only Components, tradable at the Item Exchange in the Ring of Braves for special prizes:

Defeat Sephiroth Campaign
This was a special campaign posted to promote fighting Sephiroth in the Ring of Braves. The more players that defeated Sephiroth on ★3 difficulty or higher would gain extra rewards for all players on Feb 11. A tally board tracking the number victories against Sephiroth was placed next to Meia in the Ring of Braves.
 * Feb 1 - 8, 2018

Reference

 * Feb 2018 event news page (archived)
 * Jan 2019 event news page (archived)
 * Oct 2019 event news page - Sephiroth and Cloud appear.